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#!/bin/bash

if [ $# -eq 1 ]; then
    patch="$1"
    newx=`expr $RANDOM % 200 + 100`
    newy=`expr $RANDOM % 100 + 50`
elif [ $# -eq 3 ]; then
    patch="$1"
    newx=$2
    newy=$3
else
    echo "Move a patch to a given (x,y) location on the screen"
    echo "Usage: $0 patch [x] [y]"
    exit
fi

firstline=`head -1 "$patch"`
x=`echo $firstline | sed 's|^#N canvas \([0-9][0-9]*\) [0-9 ;-]*$|\1|'`
y=`echo $firstline | sed 's|^#N canvas [0-9][0-9]* \([0-9][0-9]*\) [0-9 ;-]*$|\1|'`

replaceline=`echo $firstline | sed "s|canvas $x $y|canvas $newx $newy|"`
echo replace first line with: $replaceline
sed -i "s|$firstline|$replaceline|" $patch